Rotary pump.



No. 897,655. PATENTED SEPT. 1, 1908. L. L. PRATT.

ROTARY PUMP.

APPLICATION rum) no. 9, 1907.

2 SHEETS-SHEET 1.

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PATENTBD SEPT. 1, 1908.

L. L. PRATT. ROTARY PUMP.

APPLICATION FILED 1120.9, 1907.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

LOUIS L. PRATT, OF PHILADELPHIA, PENNSYLVANIA.

ROTARY PUMP.

To all whom it may concern.-

Be it known that I, LOUIS L. PRATT, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Rotary Pump, of which the following is a specification.

My invention relates to an improvement in a rotary pump and consists of a series of buckets and means for throwing the same into operative and inoperative positions and respectively retaining them in the same.

It further consists of a rotary device adapted to carry said buckets, the same being of novel construction, as will be hereinafter described For the purpose of explaining my inven tion, the accompanying drawings illustrate a satisfactory reduction of the same to ractice, but the important instrumenta ities thereof may be varied, and so it is to be understood that the invention is not limited to the specific arrangement and organization shown and described.

Figure 1 represents a section on line acm, Fig. 2, of a pump embodying the invention. Fig. 2 represents a section thereof on line 'yy, Fig. 1. Fig. 3 represents a perspective view of a detached portion thereof.

Similar letters of reference indicate corresponding parts in the figures.

In the drawings :1 designates a casing, which is provided with stuffing boxes 2, in which latter is mounted the driving shaft 3.

4 designates a drum, which is located within the casing and composed of the side heads 5 and 6, the cross-bars 7, which connect the same, and the hub 8, which is secured to the head 5 and occu ies the center of the drum, it being noticed t at the head 6 is open or of the form of an annulus, and that the shaft 3 asses through the hub 8 and is ke ed or 0t erwise secured thereto.

11 the heads 5 and 6 are transversely-extending openings forming bearings 9 for the gudgeons 10 of swinging buckets 11, which occupy positions between said heads, one of the portlons of each bucket having a shoulder 12 thereon, which when the buckets are closed, abuts against a shoulder 13 on the adjacent cross-bars 7, thus limiting the closing motion of the buckets, it being also noticed that the other portion of the bucket, when the latter is in open or operative position, is adapted to abut a ainst the hub 8, so as to be firmly sustaine while also being Specification of Letters Patent.

Application filed December 9, 1907.

Patented Sept. 1, 1908.

Serial No. 405,647.

limited in its opening motion, and that the last named portion is made lighter than the other portion, so that the bucket will swing by gravity to its operative position, as shown at the bottom of Fig. 1. The hub 8 forms a common stop for all of the buckets when in their operative positions. Each pair of the gudgeons 10 is connected with the respective bucket intermediate of the ends of the latter, so that the strain of the water on the bucket in lifting the same is equalized from, end to end of the bucket.

Secured to the side of the casing and to the head 6, is the abutment 14, which extends through the opening of said head into the casing and around the hub 8 and has a cam face 15, which is eccentric to the axis of the drum, said. face being adapted to form a rolling contact for the lighter end of the bucket, the remaining face of said abutment being concentric to said axis.

Secured to the interior of the circumferential wall of the casing, is the abutment 16, which projects into the peripheral portion of the drum between the heads 5 and 6, and has part of its inner face of the form of a cam 17, which is eccentric to the axis of the drum, and another portion 18 concentric with said axls.

The casing is provided respectively with an inlet 19 and outlet 20 for evident pur poses.

The operation is as follows :PoWer is applied to the shaft 3 to rotate the same, and consequently the drum, whereby the buckets are carried around with said drum. When a bucket is in the position shown at the bottom of Fig. 1, it is taking water, and the latter is raised through the casing and discharged through the outlet 20. Then the bucket is carried towards the abutment 14, and when its lighter or inner portion reaches the cam face 15 of the abutment 14:, it rolls on the same and so is positively turned towards a closing position, as shown by the upper bucket in Fig. 1. Then the bucket owing to the position of its heavier portion, fully closes by gravity towards the body of the cam 14, this eing permitted by the eccentric portion or cam 17 of the abutment 16, said portion now abutting against the adjacent cross-bar 7, and so being properly controlled against further closin motion as it moves through the passage between the concentric faces of the abutments 14 and 16, as shown at the left side of Fig. 1. Then the bucket lowers, and

and as it clears the terminal of the abutment 16, it turns on its axis and reassumes its lirst position, one portion turning from its abutment 7, and the other portion turning towards the hub 8, with which latter it abuts, when it is again operi'itive, as shown at the bottom of Fig. 1.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a rotary pump, a casing, a rotatable drum therein, a shaft-receiving hub centrally in said drum.rotatably-conncctcd therewith, a bucket mounted within said drum, and a transversely-extending connection for the heads of said drum, said hub and connection forming stops for the opposite ends of said bucket in the rotation of the latter with the drum which carries the same.

2. In a rotary pump, a casing, an inlet and an outlet therefor, a drum in said casing, a bucket pivoted intermediate of its ends to said drum, means within the periphery of said drum for causing said bucket to swing in one direction and means within the periphery of said drum whereby said bucket swings by gravity in the opposite direction said drum being provided with a plurality of sto s respectively for the opposite ends of sai buckets.

3. In a rotary pump, a casing, an inlet and an outlet therefor, a drum in said casing, a shaftreceiving hub on said drum and rotatable therewith, buckets pivoted to said drum, means within the periphery of said drum outside said hub for engaging said buckets and causing them to swing in one di rection, and means within the periphery of said drum whereby said buckets swing by avity in the opposite direction, said hub orming a common stop for said buckets for engagement with one end of the latter, and

means on the drum serving as stops for the other, ends of said buckets. v 4. In a rotary pump, a casing, an inlet and an outlet therefor, a drum in said casing, buckets pivoted to said drum, means whereby said )uckets swing by gravity in one direction, a comn'ion stop for said buckets, means for causing said buckets to swing in the opposite direction, and a stop for the buckets in the path of travel of said buckets.

5, In a rotary pump, a casing, an inlet and an outlet therefor, a drum in said casing, buckets pivoted to said. drum, stops adapted for the opposite ends of said buckets, and means to overturn said buckets.

(i. In a rotary pump, a casing, an inlet and an outlet therefor, a drum in said casing, a head forming one side of said drum, an annulus forming the other side thereof, a bucket pivoted between said head and annulus, means to oscillate said bucket, a stop to limit such oscillation in one direction, and connections for said head and ring forming stops in the other direction.

7 In a rotary pump, a casing, an inlet and an outlet therefor, a drum in said casing, a head forming one side of said drum, an annulus forming the other side thereof, buckets pivoted between said head and annulus, means adapted to swing said buckets to operative position, a cam adapted to swing said buckets to inoperative position, a stop on said drum common to said buckets in operative position, and stops on the buckets and drum adapted to interlock for holding the buckets in inoIperative position.

8. n a rotary pum. a bucket carrying drum composed of side lieads, a hub centrally on one of said heads, and connections for said heads, the other head being of the form of an annulus, said hub and connections forming stops for the bucket respectively in its operative and inoperative positions.

LOUIS L. PRATT.

Witnesses:

JOHN A. WIEDERSHEIM, HARRY C. DALTON. 

